Neutrophils as regulators of cardiovascular inflammation

Neutrophils have traditionally been viewed as bystanders or biomarkers of cardiovascular disease. However, studies in the past decade have demonstrated the important functions of neutrophils during cardiovascular inflammation and repair. In this Review, we discuss the influence of traditional and novel cardiovascular risk factors on neutrophil production and function. We then appraise the current knowledge of the contribution of neutrophils to the different stages of atherosclerosis, including atherogenesis, plaque destabilization and plaque erosion. In the context of cardiovascular complications of atherosclerosis, we highlight the dichotomous role of neutrophils in pathogenic and repair processes in stroke, heart failure, myocardial infarction and neointima formation. Finally, we emphasize how detailed knowledge of neutrophil functions in cardiovascular homeostasis and disease can be used to generate therapeutic strategies to target neutrophil numbers, functional status and effector mechanisms. In this Review, Soehnlein and colleagues discuss the role of neutrophils in cardiovascular inflammation and repair, describing the effect of cardiovascular risk factors on neutrophil production and function, appraising the contribution of neutrophils to the different stages of atherosclerosis and its clinical manifestations, and highlighting the evolving therapeutic strategies for targeting neutrophil numbers, functional status and effector mechanisms.